VBIOS can't switch to external device when I use xf86-video-ati driver

[Jhih-Sin Chen]

On 6/26/08, Alex Deucher <alexdeucher at gmail.com> wrote:
> On Thu, Jun 26, 2008 at 2:58 AM, Jhih-Sin Chen <jschen.cse at gmail.com> wrote:
> > On 6/25/08, Alex Deucher <alexdeucher at gmail.com> wrote:
> >> On Wed, Jun 25, 2008 at 10:50 AM, Jhih-Sin Chen <jschen.cse at gmail.com> wrote:
> >> > On Wed, Jun 25, 2008 at 10:26 PM, Alex Deucher <alexdeucher at gmail.com> wrote:
> >> >> On Wed, Jun 25, 2008 at 9:56 AM, Jhih-Sin Chen <jschen.cse at gmail.com> wrote:
> >> >>> Hi,
> >> >>>
> >> >>> I am using Radeon HD 3470 card with xf86-video-ati 6.8.192 on my laptop.
> >> >>> I try to implement hotkey function to switch display device.
> >> >>> I have set _DOS parameter in ACPI and ask VBIOS to switch display
> >> >>> device but it fails.
> >> >>>
> >> >>> However, the hotkey function can switch display device successfully
> >> >>> when I use "vesa" driver.
> >> >>> Do you have any suggetion on this issue? Thanks.
> >> >>
> >> >> It's disabled on purpose.  The bios goes behind the driver's back and
> >> >> messes with the hardware which can lead to bad state or possibly hw
> >> >> locks.  You can control the outputs with xrandr so please use that.
> >> >> On most laptops you can even change the video hotkey to produce acpi
> >> >> events rather than banging the hw directly and then you tie that event
> >> >> to a script that runs xrandr commands.
> >> >>
> >> >> Alex
> >> >>
> >> >
> >> > Hi,
> >> >
> >> > But I can't use xrandr to swtich display device to HDMI. Is it a
> >> > limitation of xrandr or anything wrong?
> >> >
> >>
> >> what sort of problem are you having?
> >> xrandr --output HDMI-0 --auto
> >> should do the trick.
> >>
> >> What does the output of xrandr look like?
> >
> > "xrandr -q" always show "hdmi-0 disconnected" even if my laptop
> > connect to HDMI device.
> > "xrandr --output HDMI-0 --auto" show nothing and can't switch to HDMI.
> >
> > Where is the start point to debug this issue? Thank you.
> >
>
> We'd need to see your log.  Can you post your xorg log and config?
>
> In the meantime you can force the output on with xrandr using something like:
>
Hi,
The attached files are my xorg log and config.
I use the following method to switch HDMI but it still fails. Thanks.

> xrandr --newmode "1024x768R"   56.00  1024 1072 1104 1184  768 771 775
> 790 +hsync -vsync
> xrandr --addmode HDMI-0 "1024x768R"
> xrandr --output HDMI-0 --mode "1024x768R"
>
> Replace the 1024x768 mode with whatever mode you want to use on your HDMI port.
> you can generate the modeline with cvt:
> cvt -r 1024 768 60
> or (non-reduced blanking modes):
> cvt 1024 768 60
>
> Thanks,
>
> Alex
>
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